Example SiD: field setup, add largest_step=10m

there are many overlaps in the model, regardless of unit system used, but sometimes a track can get stuck, this avoids it for the test case

examples/CLICSiD/sim/field.xml

@@ -17,6 +17,7 @@
 		type="Geant4FieldSetup"
 		object="GlobalSolenoid"
 		global="true"
+		largest_step="10*m"
 		min_chord_step="0.01*mm"
 		delta_chord="0.25*mm"
 		delta_intersection="1e-05*mm"